Go for the 45 ! More power is always better - with the 45, you are more likely to get slightly better than advertised, so it would be a better choice for later flexibility. I really do recommend the option with the case for the extra $20.00 though - I have not been able to locate those cases anywhere form any company, without having to pay for 750 of them to be made to my specifications. That is not an option I am willing to take, WAY too much investment. But - go for the link I sent oyu - I can assure you that you will like the hard case versus the soft cardboard one they normally come in.